If I might hop in, Murray strikes me as, basically, just an honest guy. He knows what he knows and will impart his knowledge, which must be extensive considering how focused he's been in his life. He doesn't always have the right polish about how he presents himself, granted, and can come off as a bit of a square but who cares.
I think that about hits it, partly just because of the way he speaks. Plus, I've seen the odd photo where he's hammering a blade with a sidearm on his belt. Not sure if that's what his mentor over in Kyushu envisioned when naming him a '16th generation Yoshimoto bladesmith' but so be it!